Define the unit 'watt'. How is it related to horse power?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A body does 20 J of work in 10 s. What is its power?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Name the physical quantity associated with the 'rate of doing work'.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Name the practical unit of power.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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In what form is energy stored in a wrist watch?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Name the physical quantity whose SI unit is Nm.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A body is pivoted at a point. A force of 10 N is applied at a distance of 30 cm from the pivot. Find the moment of force about the pivot.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Is it easier to turn a steering wheel of large diameter than that of small diameter? Why?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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What is meant by equilibrium?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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What is meant by the principle of moments?
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Name the CGS unit of work.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
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[2] Work, Energy and Power
Chapter: [2] Work, Energy and Power
Concept: undefined >> undefined
